20427865 has 8 divisors (see below), whose sum is σ = 24929280. Its totient is φ = 16065072.

The previous prime is 20427859. The next prime is 20427871. The reversal of 20427865 is 56872402.

It is an interprime number because it is at equal distance from previous prime (20427859) and next prime (20427871).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20427865 - 2⁵ = 20427833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20427865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34329 + ... + 34918.

It is an arithmetic number, because the mean of its divisors is an integer number (3116160).

Almost surely, 2^20427865 is an apocalyptic number.

It is an amenable number.

20427865 is a deficient number, since it is larger than the sum of its proper divisors (4501415).

20427865 is an equidigital number, since it uses as much as digits as its factorization.

20427865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69311.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20427865 is about 4519.7195709469. The cubic root of 20427865 is about 273.3637937829.

The spelling of 20427865 in words is "twenty million, four hundred twenty-seven thousand, eight hundred sixty-five".